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Science > Forces - PHYSICS > Flashcards

Forces - PHYSICS Flashcards

1
Q

What is displacement?

A

The overall distance travelled in a certain direction

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2
Q

What are vectors

A

Special quantities in science that both have a size and a direction

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3
Q

What is a scalar?

A

Something that has a size/magnitude but bi direction

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4
Q

What is acceleration?

A

A change in an objects velocity

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5
Q

When the gravitational field is stronger, is the weight larger or smaller?

A

Larger

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6
Q

What equation connects weight, mass and gravitational field strength?

A

Weight = mass X gravitational field strength

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7
Q

Contact forces can only exist when…

A

The objects are touching

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8
Q

Contact or non-contact? Thrust

A

Contact

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9
Q

Contact or non-contact? Gravitational/weight

A

Non-contact

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10
Q

Contact or non-contact? Friction

A

Contact

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11
Q

Contact or non-contact? Air resistance

A

Contact

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12
Q

Contact or non-contact? Tension

A

Contact

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13
Q

Contact or non-contact? Elasticity

A

Contact

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14
Q

Contact or non-contact? Electrostatics

A

Non-contact

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15
Q

Contact or non-contact? Magnetism

A

Non-contact

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16
Q

Contact or non-contact? Upthrust

A

Contact

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17
Q

Contact or non-contact? Lift

A

Contact

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18
Q

Contact or non-contact? Water resistance

A

Contact

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19
Q

What is Newton’s third law?

A

Every action has an equal and opposite reaction

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20
Q

What is Newton’s first law of motion?

A

If the resultant forces are zero
-the forces are balanced
-If the object is already moving it will continue to do so at a constant speed
-if not it will remain stationary

21
Q

What is the objects centre of mass?

A

The point at which the weight of an object appears to act from

22
Q

For unsymmetrical objects how do you work out the centre of mass?

A

You hang them from different points along a plumb line and draw these lines of the object and where they cross over is the centre

23
Q

Where is the centre of mass for a symmetrical object?

A

Where the lines of symmetry cross

24
Q

What is Newton’s second law?

A

Force is directly proportional to acceleration.

25
Q

What equation links force, mass and acceleration?

A

Force = mass X acceleration

26
Q

What is the equation for acceleration?

A

Final velocity- initial velocity/ time taken

27
Q

What does precise data give you?

A

Results which are similar to each other if you repeat the measurements

28
Q

What does accurate data give you?

A

Data which is close to the true value

29
Q

What are random errors?

A

Errors made by the person carrying out the measuring and are normally down to timing incorrectly. Affect precision

30
Q

What are systematic errors?

A

Errors which are the same for every measurement. Faulty equipment

31
Q

A larger resultant force leads to a ————— acceleration

A

Larger

32
Q

A larger mass leads to a ———— acceleration

A

Smaller

33
Q

As mass increases, acceleration…..

A

Decreases

34
Q

What’s the equation linking resultant force, mass and acceleration

A

Resultant force = mass X acceleration

35
Q

What is terminal velocity?

A

The maximum velocity that a freely falling object will eventually reach

36
Q

What does the mass of an object depend on?

A

The quantity of matter in it

37
Q

What is stopping distance?

A

The distance an object travels while it is attempting to stop

38
Q

Stopping distance = ———+———

A

Thinking distance + braking distance

39
Q

What can affect thinking distance?

A

Drugs
Alcohol
Tiredness
Distractions
Age

40
Q

What can affect braking distance?

A

Condition of breaks
Wet/icy roads
Road conditions
Tyre conditions

41
Q

What is the equation for spring contant?

A

Force = spring constant X extension

42
Q

What is the equation for elastic potential energy?

A

EPE = 1/2 X spring constant (k) X extension^2

43
Q

K = 1/gradient

A

Spring contant is 1/gradient

44
Q

How do you work out gradient?

A

Rise /run

45
Q

What is momentum?

A

The tendency of the object to keep moving in the same direction

46
Q

The greater the momentum the ——— it is to stop

A

Harder

47
Q

Distance =

A

Speed X time

48
Q

What does the area under the velocity time graph tell you?

A

The distance travelled

Science (9 decks)

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